Circuit-breaker tank



16, 1929. I c, AALBQRG H 1,709,648

' I CIRCUIT BREAKER TANK 1 Filed Nov. 10. 1922 WITNESSES: INVENTOR lll . FaTEldT orrucn0 cnnrsrrnn antenna. or nnnnsrnvanrn, nssrcnon no ELEGTRIG @QDFEEMWY, A @ll EElillilldYlh-= GERGUET-EREAKER TANK,

Application filed llovemher Ill), 1922. Ito. sconce,

My invention relates to circuit brealrers of the iluid type and particularly to linings tor the tanks thereof.

@ne object of my-invention is toprovide linings for circuit brealier tanks which are not subject to damage upon exposurm to flames or high temperatures.

It is also an object of my invention to provide linings tor circuit breaker tanks which are sectional and which arecapable of ready replacement.

in my prior application, Serial No. 154,8263, filed March 7, lll2l, l have shown and described a sectional lining for a circuit breaker tanlr comprising layers of micarta material. accordance with the present invention, l employ an asbestos lining combined with one oi the micarta material linings set :tortl in the former application.

The single ligure of the accompanying drawing is a sectional view of a circuit breakor and a tank therefor embodying my inven= tion,

Tn preferred embodiment oil invention, a metallic tank 1 is provided with a cover 2 surmounted by a container 3 for suitable operating mechanism. A pair of relatively movable contact members l, 5 are suspended within the tank 1 by any conventional. means. The 'l is generally filled with fluid, such as oil, to a depth suficient to submerge the relatively movable contact members t and 5. These parts ma be oil an conven-' tional design, as they form no part of this invention. v

ll ithin the 1, ll place a plurality of linings and 8. in this embodiment of my invention, l have shown a single pair of such linings, although it is to be understood that the number of linings may be varied to tit the need of any desired size of tanlr. lln the preferred form of my invention, the outer layer '2? is formed oil a phenolic condensation product, commonly known as micarta material, although other forms of insulating fabric which are not susceptible to deterioration in the presence of oil and'arc gases, may be employed. I The inner layer 8 is composed of asbestos which has been suitably treated with a phenolic condensation product in such a manner that the inner face oii'the' lin ing is composed almost entirely or asbestos which merges with the phenolic condensation product until the outer of the lining is composed almost entirely of the phenolic condensation product. The percentage of asbestos thus diminishes directly with the distance from the inner face As is shown in the drawing, the several-layers or lining are spaced apart to allow separate removal of any lining section. The lining l is primarily an electrical insulating medium while the lining 8 is primarily a heat resisting medium with relatively poor electrical insulating characteristics. v

Suitable, brackets 9 are placed at points about the inner circumterenceot the tanlr l to support thetanlr linings.

in the operation of circuitbreakers oil this type, the separation of the relatively movable contact members 4: and 5 is accompanied by an electrical are which produces violent mechanical, chemical and thermal eii ects upon the tank structures. It is, therefore, necessary to design linings for such tanks which are insulators of electricity, are not subject to deterioration in the presence of oil and are capableoi withstanding high temperatures.

These qualities are possessed by an asbestos fiber treated with a phenolic condensation product. By this construction, the micartamaterial lining, heretofore employed, is given the added heat-resisting qualities which are inherent in asbestos, the phenolic condensation product serving as a bond and support for the asbestos fiber.

It will be apparent that various modifica tions may be made in the apparatus and in thearrangements of the several parts with out departing from the spirit of the invention,; as set forth in the accompanying claims.

1 claim as my invention i 1. In a circuit breaker structure, the com-=- bination with a lining comprising micarta' material, or a lining comprising an asbestos product.

2. In circuit breaker structure, the con bination with a lining comprising inicarta' material, of a lining comprising asbestos treated with a phenolic condensation product.

3. In a circuit breaker structure, the com= bination with a lining comprising a fiber treated with aphenclic condensation prod uct, oi a second lining comprising non-= combustible fiber treated with a phenolic con= densation product. i

d. In a circuit breaker structure, the combination with a lining comprising a phenolic condensation product, oi a second lining comllll prising a phenolic condensation product of different heat-resisting characteristics than said first-named lining.

5. A lining member comprising a phenolic condensation product having a large percentage of asbestos distributed adjacent to one face, the percentage of asbestos diminishing directly with the distance from said face.

6. A lining member comprising a phenolic condensation product having a large per.- centage of asbestos distributed adjacent to one face, the percentage of asbestos diminishing directly with the distancefrom'said face, the material'adjacent to the other face being substantially a phenolic condensation prodnot.

7. The combination with a fluid-containin'g tank for circuit interrupters, of a pair of substantially coextensive lining members, one of which is disposed within the other, one of the linings being primarily a refractory medium and'the other lining being primarily an electrical-insulating medium.

's/oases 8. The combination with a fluid-containing tank for circuit interrupters, of a pair of substantially coextensive lining members, one of which is disposed within the other, the inner lining being primarily a refractory medium and the outer lining being primarily an electrical-insulating medium. 9. In a circuit interrupter, the combination with a tank and a pair of relatively movable contact members mounted therein, of a lining for the tank comprising an outer portion of an electrical insulating material and an inner portion of a refractory material for protecting the outer portion of the tank liuing and the tank from the deleterious effects of the heat generated upon the development of electrical arcs between the relatively movable contact members.

In testimony whereof, I have hereunto subscribed my name this 4th day of November, 1922.

CHRISTIAN AALBORG. 

